SST Solid State Transformer Research Report

1.1 What is a Solid State Transformer

SSTs not only realize voltage transformation, but also provide electrical isolation, power factor correction, harmonic suppression, reactive compensation, and fault isolation. They upgrade the passive electromagnetic transmission of traditional transformers to actively controlled electronic energy management.

• Core Attributes: High-frequency, intelligent, modular, programmable.
• Energy Path: AC-DC-AC or AC-DC-DC-AC multi-stage conversion.
• Functional Positioning: Not just a transformer, but a power quality router.
• Application Value: Suitable for high-dynamic scenarios such as AI data centers, renewable energy integration, and ultra-fast charging stations.

1.2 Working Principle and High-frequency Logic

The core logic of SST is to break the physical size limitation of magnetic components by increasing the operating frequency. When the frequency increases, the core cross-sectional area and number of turns can be significantly reduced at the same magnetic flux density, which is the fundamental reason for the dramatic reduction in size and weight.

When the frequency increases by 100 times, the core area and number of turns can be reduced by two orders of magnitude, the transformer volume can be reduced to 1/10 of a traditional transformer, and the dynamic response can reach the microsecond level.